the field of medicine that specializes in the study of tumors. oncology. The branch of medicine that deals with the study and treatment of tumors.
Who are they? Millennials are currently aged 20-35, or born between 1980 and the end of 1994 (with some more generous definitions taking in those born up to 2000). They also get called Generation Y, because they follow on from Generation X (born 1965-1979), and other, less flattering names.
They are poised to surpass baby boomers (ages 51-69), who previously held the top title for largest generation in the U.S. This year, the number of millennials is expected to be at 75.3 million, while baby boomers are at 74.9 million. Millennials are growing because more immigrants in the age group are entering the country, according to the Pew Research Center.